package com.fan.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.fan.reggie.common.BaseContext;
import com.fan.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "loginCheckFilter" , urlPatterns = "/*")
public class LoginFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        log.info("拦截到请求：{}",request.getRequestURI());
        //1.获取到本次请求的url
        String url = request.getRequestURI();
        //2.判断此次请求是否需要处理，直接放行的URL
        String[] urls = new String[]{
           "/employee/login","/employee/logout",
           "/backend/**", "/front/**",
                "/user/sendMsg", //移动端发送短信
                "/user/login"  //移动端登录
        };
        boolean check = check(url, urls);
        //3.不需处理，直接放行
        if(check){
            log.info("本次请求{}不需要处理",url);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1. 需拦截，判断session是否有员工数据
        if(request.getSession().getAttribute("employee")!=null){
            log.info("员工一登录，员工id为：{}",request.getSession().getAttribute("employee"));
            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

        //4-2. 判断前端登录状态，是否有user数据
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户一登录，用户id为：{}",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        //5. 未登录,返回未登录结果，通过输出流向客户端页面写数据
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /*路径匹配方法
     *@Param requestUrl
     * @Param urls
    * */
    public boolean check(String requestUrl, String [] urls){
        for(String url : urls){
            boolean match = PATH_MATCHER.match(url, requestUrl);
            if(match)
                return true;
        }
        return false;
    }
}
